US10784082B2 - Apparatus for generating plasma and apparatus for treating substrate having the same - Google Patents
Apparatus for generating plasma and apparatus for treating substrate having the same Download PDFInfo
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- US10784082B2 US10784082B2 US16/275,523 US201916275523A US10784082B2 US 10784082 B2 US10784082 B2 US 10784082B2 US 201916275523 A US201916275523 A US 201916275523A US 10784082 B2 US10784082 B2 US 10784082B2
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- 238000010884 ion-beam technique Methods 0.000 claims description 8
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- 238000010586 diagram Methods 0.000 description 1
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- 230000001939 inductive effect Effects 0.000 description 1
- 238000009616 inductively coupled plasma Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
- H01J37/3211—Antennas, e.g. particular shapes of coils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/321—Radio frequency generated discharge the radio frequency energy being inductively coupled to the plasma
- H01J37/32119—Windows
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/32—Gas-filled discharge tubes
- H01J37/32009—Arrangements for generation of plasma specially adapted for examination or treatment of objects, e.g. plasma sources
- H01J37/32082—Radio frequency generated discharge
- H01J37/32174—Circuits specially adapted for controlling the RF discharge
- H01J37/32183—Matching circuits
Definitions
- the present disclosure relates to a plasma-generating device and a substrate-treating apparatus comprising the same. More particularly, the present disclosure relates to an inductively coupled-type plasma-generating device, and a substrate-treating apparatus comprising the same.
- Plasma-generating devices include an inductively coupled type and capacitive coupled type plasma-generating devices.
- generated plasma has a high density but the plasma may be generated non-uniformly.
- it is necessary to add a new component to the plasma generating apparatus or to modify existing components. This may complicate a structure of the plasma generating apparatus.
- a scheme of simultaneously applying two different frequencies to a portion of a coil for plasma generation has been proposed for improving the uniformity of the plasma while minimizing the change of the structure of the apparatus.
- a long coil is required in order to solve impedance mismatch which may occur due to a difference between frequencies.
- sufficient inductance cannot be secured, and, thus, a problem that discharge is not performed properly may occur continuously.
- One purpose of the present disclosure is to provide a plasma-generating device in which frequency adjustment in a wide range may be enabled by allowing sufficient inductance at low frequencies to be obtained even when different frequencies are applied to a single coil, such that the plasma may be stably generated while the uniformity of plasma via uniform power distribution may be improved.
- Another purpose of the present disclosure is to provide a substrate-treating apparatus including the plasma-generating device as described above, in which the substrate-treating apparatus may be supplied with the uniform plasma as generated by the plasma-generating device as described above and thus may improve reliability of the substrate treatment process.
- an inductively-coupled plasma-generating device including: a first power supply for supplying high frequency power; a second power supply for supplying low frequency power; a single coil-based plasma source including at least two antennas which comprise a first antenna having one end as a grounded end and the other end, wherein the first power supply is connected to the first antenna at a point thereof adjacent to the grounded end to receive the high frequency power; and a second antenna surrounded by the first antenna, wherein the second antenna has one end connected to the first antenna and the other end as a low frequency power receiving end connected to the second power supply; and a gas supply for supplying a gas, wherein the gas is excited into plasma by the single coil-based plasma source.
- each of the first and second antennas has a ring shape, and the first and second antennas are concentric with each other, and the two ends of the first antenna define a first spacing therebetween, and the two ends of the second antenna define a second spacing, wherein the first and second antennas are connected to each other such that the first spacing has the same orientation as the second spacing.
- the first power supply includes a high frequency matching circuitry
- the second power supply includes a low frequency matching circuitry, wherein the high frequency matching circuitry and the low frequency matching circuitry remove impedance mismatch due to a frequency difference.
- the single coil-based plasma source further includes third and fourth antennas disposed between the first antenna and the second antenna, wherein each of the third and fourth antennas has a ring shape, and the first to fourth antennas are concentric with each other, and two ends of the third antenna define a third spacing therebetween, and two ends of the fourth antenna define a fourth spacing, wherein the first to fourth spacings have the same orientation, wherein the first and third antennas are connected to each other and the fourth and second antennas are connected to each other.
- the first power supply is applied to a second end of the first antenna opposite to a first end which is the one end of the first antenna, wherein the second end of the first antenna is connected to one end of the third antenna.
- the first power supply is applied to a position between a first end of the first antenna which is the grounded end of the first antenna and a second end of the first antenna opposite to the first end of the first antenna.
- the inductively-coupled plasma-generating device may further comprise first and second filters for preventing the high frequency power from being applied to the low frequency power, wherein the first filter is disposed between the first power supply and the first antenna, and the second filter is disposed between the second power supply and the second antenna.
- the inductively-coupled plasma-generating device may further comprise a dielectric window disposed between the single coil-based plasma source and the gas supply.
- a thickness of the dielectric window in a region corresponding to the first antenna to which the high frequency power is applied is larger than a thickness of the dielectric window in a region corresponding to the second antenna to which the low frequency power is applied.
- the inductively-coupled plasma-generating device may further comprise at least one power supply which applies a power having a frequency which is different from the high frequency power and the low frequency power to a third antenna, wherein the single coil-based plasma source further comprises the third antenna.
- a substrate-treating apparatus including the plasma-generating device according to one of claims 1 to 10 , wherein the substrate-treating apparatus treats a target substrate using the plasma supplied from the plasma-generating device.
- the substrate-treating apparatus may further comprise a plasma converting unit disposed between a process chamber receiving the target substrate therein and the plasma-generating device, wherein the plasma converting unit is configured to convert the plasma from the plasma-generating device into ion beams or neutral beams and feed the ion beams or neutral beams into the target substrate.
- a plasma converting unit disposed between a process chamber receiving the target substrate therein and the plasma-generating device, wherein the plasma converting unit is configured to convert the plasma from the plasma-generating device into ion beams or neutral beams and feed the ion beams or neutral beams into the target substrate.
- the plasma discharge may be stably performed merely by applying the low frequency power and the high frequency power to the single coil-based plasma source though the existing hardware configuration is not significantly modified or remodeled.
- the uniform plasma discharge does not occur due to the difference between the frequencies.
- frequency adjustment in a wide range may be enabled by allowing sufficient inductance at low frequencies to be obtained even when different frequencies are applied to a single coil.
- the plasma may be stably generated while the uniformity of plasma via uniform power distribution may be improved.
- the substrate-treating apparatus may be supplied with the uniform plasma as generated by the plasma-generating device as described above and thus may improve reliability of the substrate treatment process.
- FIG. 1 is an illustration of a substrate-treating apparatus according to one embodiment of the present disclosure.
- FIG. 2 is an illustration of a structure of a single coil-based plasma source in the plasma-generating device of FIG. 1 and of frequency application for discharge.
- FIG. 3 is an illustration of a single coil-based plasma source of a different type than that of FIG. 2 .
- FIG. 4 is an illustration of a dielectric window structure that is different from that of FIG. 1 .
- FIG. 5 is an illustration of a substrate-treating apparatus according to another embodiment of the present disclosure.
- first and second are used herein to describe various elements, these elements should not be limited by these terms. Terms are only used to distinguish one component from other components. Therefore, a component referred to as a first component in one embodiment can be referred to as a second component in another embodiment.
- FIG. 1 is an illustration of a substrate-treating apparatus according to one embodiment of the present disclosure.
- FIG. 2 is an illustration of a structure of a single coil-based plasma source in the plasma-generating device of FIG. 1 and of frequency application for discharge.
- a substrate-treating apparatus 700 is configured treating a target substrate using plasma.
- the substrate-treating apparatus 700 includes a plasma-generating device PGA that produces plasma.
- the plasma generated by the plasma-generating device PGA may be supplied to a stage STG on which the target substrate is placed.
- the plasma-generating device PGA includes a single coil-based plasma source 100 , a gas supply 210 , and a dielectric window 220 .
- the single coil-based plasma source 100 is supplied with both low frequency power and high frequency power.
- a single coil of the single coil-based plasma source 100 has a first end as a grounded end, and a second end supplied with the low frequency power.
- the high frequency power is applied to a portion of the coil between the grounded end and the second end and adjacent to the grounded end.
- the high frequency power is supplied from a first power supply including a first power generator 112 and a high frequency matching circuitry 114 to the single coil-based plasma source 100 .
- the impedance matching may be realized by the high frequency matching circuitry 114 .
- the first power supply may further include a first controller that controls the first power generator 112 or the high frequency matching circuitry 114 to enable the impedance matching.
- the low frequency power is supplied to the single coil-based plasma source 100 from a second power supply including a second power generator 122 and a low frequency matching circuitry 124 .
- the impedance matching may be realized by the low frequency matching circuitry 124 .
- the second power supply may further include a second controller (not shown) to control the second power generator 122 or the low frequency matching circuitry 124 to enable the impedance matching.
- Filters 116 and 126 may be disposed between the single coil-based plasma source 100 and the first power supply and the second power supply respectively.
- the filters 116 and 126 may prevent the high frequency power from being applied to the low frequency power.
- the single coil-based plasma source 100 includes at least two or more antennas that are connected to each other to form the single coil.
- the antennas are connected together to form the single coil-based plasma source.
- Each of the antennas may have a ring shape having a spacing.
- a first antenna is disposed at the outermost of the single coil-based plasma source 100 .
- a second antenna is disposed within the first antenna in a concentric manner thereto and is connected to the first antenna. In this connection, a spacing of the first antenna and a spacing of the second antenna may be oriented in the same direction.
- one of two ends defining the spacing of the first antenna is connected to one of two ends defining the spacing of the second antenna as shown in FIG. 2 .
- one of the two ends of each antenna provided is referred to as a first end, while the other end thereof is referred to as a second end.
- the first end of the first antenna acts as the grounded end.
- the second end of the first antenna is connected to the first end of the second antenna.
- the second end of the second antenna is fed with the low frequency power.
- the high frequency power is applied to a point of the first antenna between the grounded end and the second end.
- the single coil-based plasma source 100 may include four antennas as in FIG. 2 .
- a first antenna 100 a is disposed at the outermost of the single coil-based plasma source 100 .
- a second antenna 100 b as the innermost antenna is disposed within the first antenna 100 a in a concentric manner thereto.
- third and fourth antennas 100 c and 100 d are arranged concentrically between the first and second antennas 100 a and 100 b .
- linear spacings of the first to fourth antennas may be oriented in the same direction. That is, the first 100 a , third 100 c , fourth 100 d and second 100 b antennas may be arranged concentrically in this order from the outermost to the innermost.
- the first and second antennas 100 a and 100 b are connected via the third and fourth antennas 100 c and 100 d .
- the second end of the first antenna 100 a spaced from the grounded end of the first antenna 100 a is connected to the first end of the third antenna 100 c
- the second end of the third antenna 100 c is connected to the first end of the fourth antenna 100 d
- the second end of the fourth antenna 100 d is connected to the first end of the second antenna 100 b .
- the low frequency power is applied to the second end of the second antenna 100 b .
- the high frequency power is applied to the second end of the first antenna 100 a.
- the single coil-based plasma source 100 may have a helical single coil configuration in which the coil extends from the grounded end of the first antenna along the third, fourth and second antennas in a counter-clockwise direction in a helical manner.
- one end of the two ends of each antenna is connected not to an end of an adjacent antenna not located in the same line as said one end in FIG. 2 , but to an end of the adjacent antenna located in the same line as said one end in FIG. 2 .
- adjacent antennas may be connected via a linear connector connecting ends of the adjacent antennas spaced from each other at a shorter distance.
- the single coil-based plasma source 100 may have a single coil configuration in which the coil extends from the grounded end of the first antenna in a counterclockwise and then extends clockwise from an end of the third antenna in the same line as the grounded end and then extends along the fourth antenna in the counterclockwise direction and then is connected to the second antenna, and then extends along the second antenna in the clockwise direction.
- the low frequency power may be applied to the end of the second antenna.
- the low frequency power is applied to the second antenna, and the high frequency power is applied to an end of the first antenna adjacent to the grounded end.
- the impedance difference due to the frequency difference between the low frequency and the high frequency may be removed. This results in a stable discharge, so that both the low frequency power and the high frequency power may be applied to the single coil-based plasma source 100 .
- the substrate-treating apparatus 500 may more easily control the etching, deposition, and the like of the target substrate.
- FIG. 1 and FIG. 2 illustrate one example in which the first and second power supplies to supply the low frequency power and high frequency power respectively are used in discharging.
- a third power supply may be further included to generate plasma using triple frequencies in the single coil-based plasma source 100 .
- At least one variable element may be connected to and between the antennas of the single coil-based plasma source 100 .
- the variable element may include a variable capacitor.
- FIG. 1 and FIG. 2 illustrate one example in which the first and second power supplies to supply the low frequency power and high frequency power respectively are used in discharging.
- a third power supply 132 and a middle frequency matching circuitry 134 may be further included to generate plasma using triple frequencies in the single coil-based plasma source 100 .
- the gas supply 210 is disposed adjacent to the single coil-based plasma source 100 .
- the gas supplied from the gas supply 210 to a reaction chamber is excited into the plasma state via the discharge of the single coil-based plasma source 100 .
- the gas supply 210 may be provided below the single coil-based plasma source 100 and may have a form of a ring-shaped gas line having a plurality of gas injection holes.
- the dielectric window 220 is interposed between the single coil-based plasma source 100 and the gas supply 210 .
- the dielectric window 220 may reduce a capacitively-coupled plasma (CCP) component between the single coil-based plasma source 100 and the plasma.
- CCP capacitively-coupled plasma
- the reduction of the capacitively coupled plasma component may reduce the occurrence of sputtering, thereby preventing the life of the dielectric window 220 from decreasing, and, at the same time, may assist in energy transfer from the high frequency power to the plasma via inductive coupling.
- the plasma-generating device PGA having the single coil-based plasma source 100 in accordance with the present disclosure as described above and to the substrate-treating apparatus 500 including the same there occurs an advantage that the plasma discharge may be stably performed merely by applying the low frequency power and the high frequency power to the single coil-based plasma source 100 though the existing hardware configuration is not significantly modified or remodeled.
- frequency adjustment in a wide range may be enabled by allowing sufficient inductance at low frequencies to be obtained even when different frequencies are applied to the single coil based plasma source 100 .
- the plasma may be stably generated while the uniformity of plasma via uniform power distribution may be improved.
- the substrate-treating apparatus 500 may be supplied with the uniform plasma as generated by the plasma-generating device PGA as described above and thus may improve reliability of the substrate treatment process.
- FIG. 3 a substrate-treating apparatus according to another embodiment different from the substrate-treating apparatus as illustrated in FIGS. 1 and 2 will be exemplified.
- descriptions of substantially the same parts between the substrate-treating apparatuses according to the embodiments of the present disclosure are omitted. Differences therebetween will be exemplified with reference to the drawings.
- FIG. 3 is an illustration of a single coil-based plasma source of a different type from that of FIG. 2 .
- a single coil-based plasma source 101 of a different structure from that of the single coil-based plasma source 100 of FIG. 1 and FIG. 2 may be composed of a first antenna 101 a disposed at the outermost and a second antenna 101 b connected thereto and disposed inside the first antenna 101 a in a concentric manner.
- a first end of the first antenna 101 a is grounded and thus acts as a grounded end.
- a second end of the first antenna 101 a is connected to a first end of the second antenna 101 b .
- the low frequency power is applied to a second end of the second antenna 101 b.
- the single coil extends clockwise from the grounded end of the first antenna and then extends counterclockwise from the first end of the second antenna.
- the low frequency power may be applied to the second end of the second antenna.
- the high frequency power may be applied to a point of the first antenna adjacent to the grounded end and spaced from the second end of the second antennas where the low frequency power is applied.
- FIG. 4 is a diagram for illustrating a structure of a dielectric window different from that of FIG. 1 .
- a dielectric window 222 having a structure different from that of the dielectric window 220 of FIG. 1 and FIG. 2 may be configured so as to have different thicknesses in regions respectively corresponding the antennas constituting the single coil-based plasma source 100 .
- a first thickness of the dielectric window 222 in a region corresponding to the first antenna to which the high frequency power is applied is large, while a second thickness of the dielectric window 222 in a region corresponding to the second antenna to which the low frequency power is applied is small.
- a third thickness of the dielectric window 222 in a region corresponding to the third antenna may be smaller than the first thickness and may be larger than the second thickness.
- a fourth thickness of the dielectric window 222 in a region corresponding to the fourth antenna may be smaller than the third thickness and be larger than the second thickness.
- a thickness of the dielectric window 222 in a region corresponding to each of regions between the antennas is equal to the first thickness.
- a thickness of the dielectric window 222 may be gradually decreased from a position corresponding to the first antenna to a position corresponding to the second antenna. That is, the dielectric window 222 may be formed in a dome shape.
- a cross-sectional shape is a rectangular shape is exemplarily shown as an example. The present disclosure is not limited thereto.
- the cross-sectional shape may be a trapezoidal shape.
- a conventional dielectric window used for isolation between the plasma source and a vacuum chamber is embodied as a plate having a considerably large thickness in order to prevent breakage of the dielectric window due to a pressure difference resulting from a vacuum.
- this thick plate window may be prevented from being damage, but may cause a capacitively coupled plasma CCP component to be formed in addition to the inductively coupled plasma.
- the thickness of the dielectric window 222 may vary based on the applied powers. This may provide for an optimal window structure that minimizes energy loss while minimizing the possibility of breakage of the dielectric window. That is, the dielectric window 222 having such a thickness configuration may more effectively reduce the capacitively coupled plasma CCP component occurring between the single coil-based plasma source 100 and the plasma while preventing the dielectric window 222 from breaking.
- the dielectric window 222 with the thickness variation is used in combination with the single coil-based plasma source 100 including the four antennas.
- the present disclosure is not limited thereto.
- the thickness configuration of the dielectric window may be adapted to the two antennas.
- FIG. 5 is an illustration of a substrate-treating apparatus according to another embodiment of the present disclosure.
- the substrate-treating apparatus 700 further includes an plasma converting unit 300 and a substrate treatment chamber 400 together with the plasma-generating device PGA illustrated in FIGS. 1 and 2 .
- the stage STG on which the target substrate is placed is disposed in the substrate treatment chamber 400 .
- the plasma converting unit 300 may be configured for receiving, guiding and converting the plasma generated by the plasma-generating device PGA into ion beams and supplying the ion beams to the substrate treatment chamber 400 .
- the plasma converting unit 300 may be composed of a stack of grids having guide holes defined therein.
- the plasma converting unit 300 may feed neutral beams to the substrate treatment chamber 400 .
- the plasma-generating device PGA may supply the uniform plasma, the ion beam or neutral beam may be uniformly generated.
- the deposition or etching of the thin film is stably performed. In this way, the reliability of the treatment process can be improved.
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KR1020180018622A KR101914902B1 (en) | 2018-02-14 | 2018-02-14 | Apparatus for generating plasma and apparatus for treating substrate having the same |
KR10-2018-0018622 | 2018-02-14 |
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